Add scripts and README used in Windows plugins releases

utils/README-DPF-Windows.txt

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+######################################
+## Generic README for DISTRHO Plugins
+
+This folder contains audio plugins downloaded from http://distrho.sourceforge.net/plugins
+
+The included *.lv2 folder is an LV2 bundle and the *.dll file is a VST.
+Check your host documentation to know where to place these files.
+Note that most hosts support VST but not LV2.
+
+
+If your host is not listing these plugins, make sure the binaries you downloaded match your host architecture.
+32bit plugins go into 32bit hosts, same for 64bit.
+Some hosts are able to load plugins with different architecture, but that's the exception rather than the rule.

utils/pack-win-dlls.sh

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+#!/bin/bash
+
+set -e
+
+# --------------------------------------------------------------------------------------------------------------------------------
+# extract debs and pack them
+
+function compressFolderAsZip() {
+rm -f "$1.zip"
+zip -X -r "$1" "$1"
+rm -r "$1"
+}
+
+# --------------------------------------------------------------------------------------------------------------------------------
+
+if [ "$1" == "" ]; then
+echo Missing argument
+exit
+fi
+
+# --------------------------------------------------------------------------------------------------------------------------------
+
+cd bin
+
+mkdir -p tmp
+rm -rf tmp/*
+
+NAME="$1"
+
+_mingw32-build make -C .. clean
+_mingw32-build make -C ..
+for i in `ls *-vst.dll`; do mv $i `echo $i | awk 'sub("-vst","")'`; done
+rm -rf *ladspa* *dssi* *vst*
+mkdir -p "$NAME-win32bit"
+mv *.dll *.lv2/ "$NAME-win32bit"
+cp "../dpf/utils/README-DPF-Windows.txt" "$NAME-win32bit/README.txt"
+compressFolderAsZip "$NAME-win32bit"
+rm -rf tmp/*
+
+_mingw64-build make -C .. clean
+_mingw64-build make -C ..
+for i in `ls *-vst.dll`; do mv $i `echo $i | awk 'sub("-vst","")'`; done
+rm -rf *ladspa* *dssi* *vst*
+mkdir -p "$NAME-win64bit"
+mv *.dll *.lv2/ "$NAME-win64bit"
+cp "../dpf/utils/README-DPF-Windows.txt" "$NAME-win64bit/README.txt"
+compressFolderAsZip "$NAME-win64bit"
+rm -rf tmp/*
+
+_mingw64-build make -C .. clean
+
+cd ..
+
+# --------------------------------------------------------------------------------------------------------------------------------